A Train weighs 25 MN. The train resistance is 100kN if 7500 hp are exerted to pull the train in a slope of 5%, determine its force required and the velocity. Also, what would be the total distance traveled after 5 seconds if the velocity is constant.
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- You kick a 225 g rock from the edge of a cliff while hiking along the edge of the Grand Canyon. (a) Ignoring air resistance, find the average power delivered by the force of gravity during the first 4.00 s of the fall. (b) Find the instantaneous power delivered by the force of gravity at the end of the fifth second of the fall.A 30.0-kg child starting from rest slides down a water slide with a vertical height of 10.0 m. What is the child’s speed (a) halfway down the slide’s vertical distance and (b) three-fourths of the way down? (Neglect friction.)In a time of T seconds, a motorcycle can accelerate from rest to the speed v. (a) Determine the amount of time (in terms of 7) required for it to accelerate from v to 6v if the power output remains constant. At = (b) Determine the speed of the motorcycle (in terms of v) 3T after starting. Vf=
- A 1400-NN crate rests on the floor. How much work is required to move it at constant speed 5.0 mm vertically. Express your answer to two significant figures and include the appropriate units.A 17 g bullet is accelerated in a rifle barrel81.5 cm long to a speed of 846 m/s.Use the work-energy theorem to find theaverage force exerted on the bullet while it isbeing accelerated.Answer in units of N.What average mechanical power (in W) must a 72.0 kg mountain climber generate to climb to the summit of a hill of height 345 m in 46.0 min? Note: Due to inefficiencies in converting chemical energy to mechanical energy, the amount calculated here is only a fraction of the power that must be produced by the climber's body. HINT W Need Help? Read It Watch It
- If a 1300 kg car can accelerate from 30 km/h to 65 km/h in 4.0 s , how long will it take to accelerate from 65 km/h to 95 km/h ? Assume the power stays the same, and neglect frictional losses.A sled is initially given a shove up a frictionless 26.0 incline. It reaches a maximum vertical height 1.50 m higher than where it started at the bottom. a) What was its initial speed?Suppose the mass of a loaded elevator is 1300 kg. a) What force, in newtons, must be supplied by the elevator's cable to produce an acceleration of 0.715 m/s2 upwards against a 195-N frictional force? b) How much work, in joules, is done by the cable in lifting the elevator 21.5 m? c)What is the final speed, in meters per second, of the elevator if it starts from rest? d) How much work, in joules, was converted into thermal energy by friction? i just need part d because I keep getting the question wrong.
- (a) How long (in s) will it take an 855 kg car with a useful power output of 36.0 hp (1 hp = 746 W) to reach a speed of 13.0 m/s, neglecting friction? (Assume the car starts from rest.) (b) How long (in s) will this acceleration take if the car also climbs a 2.80 m-high hill in the process? Additional Materials O ReadingA 3.8kg box is raised from rest a distance 8.4m by an upward applied force of 7.8N. Find the work done by gravity on the box. Give the numerical value only and include sign if applicable.A sled is initially given a shove up a frictionless 23 degree incline. It reaches a maximum verticle height 1.22 m higher than where it started at the bottom. What was the initial speed?